AutoCodes – Generic – P0158

P0158 Code - O2 Sensor Circuit High Voltage Bank 2 Sensor 2

Quick Answer

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted, Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0158 indicates O2 Sensor Circuit High Voltage Bank 2 Sensor 2.
Common causes: Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted, Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 58,847

How popular is this code, among other codes? Medium

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 27, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
Comments
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Code P0158 Description

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the Engine Control Module (ECM) operates in an Open Loop mode, ignoring the HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0 - 1, 000 mV. Once sufficient HO2S voltage fluctuation is observed by the ECM, Closed Loop is entered. The ECM uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1, 000 mV indicates a rich fuel mixture. An HO2S voltage that decreases toward 0 mV indicates a lean fuel mixture.
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the ECM to calculate the air-to-fuel ratio sooner.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the HO2S voltage is greater than 1, 050 mV.

OBDII Code P0158 - O2 Sensor Circuit High Voltage Bank 2 Sensor 2 - AutoCodes.com — P0158 Code - O2 Sensor Circuit High Voltage Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0158?

Faulty Rear Heated Oxygen Sensor Bank 2
Rear Heated Oxygen Sensor Bank 2 harness is open or shorted
Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection
Low or high fuel system pressure
Fuel contamination
Faulty fuel injectors
Exhaust gas leaks
Engine vacuum leaks

How to Fix the DTC P0158?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

Replacing the Rear Heated Oxygen Sensor Bank 2 usually takes care of the problem.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0158 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Information for Specific Makes

P0158 Acura — O2 Sensor Circuit High Voltage Bank 2 Sensor 2
P0158 Audi — HO2S22 Sensor Circuit High Voltage
P0158 BMW — O2 Sensor Circuit High Voltage Bank 2 Sensor 2
P0158 Buick — HO2S Circuit High Voltage Bank 2 Sensor 2
P0158 Cadillac — HO2S Circuit High Voltage Bank 2 Sensor 2
P0158 Chevrolet — HO2S Circuit High Voltage Bank 2 Sensor 2
P0158 Chrysler — O2 Sensor 2/2 Circuit High
P0158 Dodge — O2 Sensor 2/2 Circuit High
P0158 Ford — O2 Sensor Circuit High Voltage Bank 2 Sensor 2
P0158 GMC — HO2S Circuit High Voltage Bank 2 Sensor 2
P0158 Honda — O2 Sensor Circuit High Voltage Bank 2 Sensor 2
P0158 Hyundai — HO2S Circuit High Voltage Bank 2 Sensor 2
P0158 Infiniti — HO2S22 Circuit High Voltage
P0158 Jaguar — O2 Sensor Circuit High Voltage Bank 2 Sensor 2
P0158 Jeep — O2 Sensor 2/2 Circuit High
P0158 KIA — HO2S21 Circuit High Voltage
P0158 Lexus — HO2S22 Circuit High Voltage
P0158 Mazda — HO2S LR Circuit High Input
P0158 Mercedes-Benz — O2 Sensor Circuit High Voltage Bank 2 Sensor 2
P0158 MINI — O2 Sensor Circuit High Voltage Bank 2 Sensor 2
P0158 Mitsubishi — Cylinder 2-3 Heated Oxygen Rear Sensor Circuit High Voltage
P0158 Nissan — HO2S22 Circuit High Voltage
P0158 Pontiac — HO2S Circuit High Voltage Bank 2 Sensor 2
P0158 Saturn — HO2S Circuit High Voltage Bank 2 Sensor 2
P0158 Scion — HO2S22 Circuit High Voltage
P0158 Subaru — HO2S22 Circuit High Voltage
P0158 Suzuki — HO2S Circuit High Voltage Bank 2 Sensor 2
P0158 Toyota — HO2S22 Circuit High Voltage
P0158 Volkswagen — HO2S22 Sensor Circuit High Voltage

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.